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There are several benefits of using the transient logical standby method for upgrades In fact, this method is the Oracle MAA recommended best practice, because the method is simple, reliable, and robust, and requires minimal downtime Some of the benefits of transient logical standby are highlighted here:
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The transient logical standby method utilizes an existing physical standby database for performing the upgrade and does not require the extra space for creating a new logical standby database solely for the purpose of performing the upgrade The rolling upgrade process provides the added benefit of testing the upgraded environment prior to performing the switchover The tests are performed using the new version of the Oracle software, with production data and production-like workloads This method greatly reduces the downtime required by running the pre-upgrade, upgrade, and post-upgrade tasks on the standby while the production system is still online and accessible to the users The downtime incurred by this method is essentially the time it takes for the database to perform a switchover operation to the standby database
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Switching gears a bit, this section focuses on providing high availability during database application upgrades, and not Oracle software upgrades as we were discussing earlier Upgrading user applications and database objects with zero downtime is possible by using the edition-based redefinition feature of Oracle Database 11g Release 2 Edition-based redefinition allows you to upgrade the application and its associated database objects to a newer edition (or version), while the old edition of the application and the database objects coexist and are still accessible by the users Once the upgrade process is complete, the new connections from the upgraded application will be accessing the new edition of the objects, and the users that were still connected to the old edition will continue to be serviced until they disconnect the session
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The database concepts that enable edition-based redefinitions are
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Editions An edition associates the versions of the database objects that together form a semantically intact code release The release can include all the objects, which is the case when the code is installed for the first time, or a subset of objects if the objects are modified using a patched release Database sessions execute in the context of an edition and a user is associated with an edition upon connect time Editioning views An editioning view of a database object is the definition of the object as it existed in a particular edition Editioning views expose different definitions of the database object and allow the users to see the definition that applies to its edition Cross-edition triggers Cross-edition triggers are responsible for synchronizing data changes between old and new editions of tables For example, if a table has new columns added in its latest edition, the users connected to the old edition can still perform updates using the old definition, and the cross-edition trigger will take care of populating the new columns behind the scenes
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Ensuring the high availability of the database storage grid is important for enhancing the overall availability of the Database Machine Oracle ASM provides built-in high-availability features by incorporating Grid RAID, as outlined in 5 With Grid RAID, when an underlying disk on the Exadata Storage Server fails, the data is still available from the mirrored copy placed on a different Exadata Storage Server ASM also incorporates built-in protection from data corruption, through which it will transparently access a mirrored copy when the primary copy is found to be corrupt Although the ASM redundancy level of NORMAL provides protection from multiple, simultaneous, failures and corruptions occurring in a single Exadata Storage Server, it may not protect you when the failures are spread across multiple Exadata Storage Servers In such situations, your option for recovery is to perform a restore from a backup or to fail over to the Data Guard standby database (if it is configured) The best practices outlined next guarantee higher availability and recoverability of the storage grid upon simultaneous, multiple failures that spread across multiple Exadata Storage Servers
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